Which device can be programmed to automate a variety of processes?

• A. GUI
• B. PLC
• C. Resistor
• D. Router

Answer: (B)

Automating a variety of processes requires a device that can be programmed to read inputs, make decisions, and drive outputs in real time. A programmable logic controller is built for this role. It can be programmed with logic to monitor sensors, execute control sequences, implement timers and counters, and switch actuators like motors or valves, all in an industrial setting. This versatility lets it automate routines across different machines and processes, from assembly lines to packaging.

The other devices don’t fit this purpose: a graphical user interface is for interacting with software and visualizing data rather than autonomously controlling equipment; a resistor is a passive component that doesn’t execute control logic; a router handles network traffic, not machine automation.